FR2383132A1 - Treating biological sludge to sterilise and reduce volume - by heating with sulphuric, phosphoric and calcium ions - Google Patents
Treating biological sludge to sterilise and reduce volume - by heating with sulphuric, phosphoric and calcium ionsInfo
- Publication number
- FR2383132A1 FR2383132A1 FR7706691A FR7706691A FR2383132A1 FR 2383132 A1 FR2383132 A1 FR 2383132A1 FR 7706691 A FR7706691 A FR 7706691A FR 7706691 A FR7706691 A FR 7706691A FR 2383132 A1 FR2383132 A1 FR 2383132A1
- Authority
- FR
- France
- Prior art keywords
- pts
- heating
- pref
- minus
- plus
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/18—Treatment of sludge; Devices therefor by thermal conditioning
- C02F11/185—Treatment of sludge; Devices therefor by thermal conditioning by pasteurisation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/18—Treatment of sludge; Devices therefor by thermal conditioning
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B17/00—Other phosphatic fertilisers, e.g. soft rock phosphates, bone meal
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Treatment Of Sludge (AREA)
Abstract
The excess sludge from biological waste sludge purificn. installations is treated by adding per 100 pts. of material in suspension 3.6-7.6 pts. (pref. 4 plus-or-minus 0.4 pts) of sulphuric ions, 2.4-5.2 pts (pref. 2.7 plus-or-minus 0.3 pts) of phosphoric ions, and 1-8-3.9 pts (pref. 2.1 plus-or-minus 0.3 pts) of Ca ions and then heating. The process uses relatively lower heating temp and pressure. The reactant used passifies steel and impedes encrustation; process does not release gs or result in disagreeable odours. The additives enhance the value of the treated sludge as a fertiliser. The proportions of the reactant may be achieved from sulphuric acid/calcium phosphate or sulphuric acid/phosphoric acid/lime or phosphoric acid/calcium sulphate and esp. the fertiliser superphosphate 18 plus-or-minus 2% P2O5 at 10-20 pts, pref. 10-12 pts per 100 pts material in suspension. The pH of the material after the addn. is adjusted if required to 5.5-6 with sulphuric acid. The heating may be carried out continuously or discontinuously in a pressure vessel at 155-180 degrees C, esp. 160-170 degrees C, and at 5-7.5 bams pressure for 45-90 mins, esp. 50-75 mins. The heating is pref. carried out by direct steam injection.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7706691A FR2383132A1 (en) | 1977-03-08 | 1977-03-08 | Treating biological sludge to sterilise and reduce volume - by heating with sulphuric, phosphoric and calcium ions |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7706691A FR2383132A1 (en) | 1977-03-08 | 1977-03-08 | Treating biological sludge to sterilise and reduce volume - by heating with sulphuric, phosphoric and calcium ions |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2383132A1 true FR2383132A1 (en) | 1978-10-06 |
FR2383132B1 FR2383132B1 (en) | 1980-02-22 |
Family
ID=9187702
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7706691A Granted FR2383132A1 (en) | 1977-03-08 | 1977-03-08 | Treating biological sludge to sterilise and reduce volume - by heating with sulphuric, phosphoric and calcium ions |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR2383132A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0145700A1 (en) * | 1983-11-11 | 1985-06-19 | VOEST-ALPINE Aktiengesellschaft | Process and apparatus for the production of hydrolysates from sewage sludges, organic substances or wastes to obtain substances for use in the biotechnology |
EP0146526A1 (en) * | 1983-11-11 | 1985-06-26 | VOEST-ALPINE Aktiengesellschaft | Process for the production of organic substances or hydrolysates from sewage sludges to obtain substrates for use in the bio industry |
CN102633424A (en) * | 2011-02-10 | 2012-08-15 | 栗田工业株式会社 | Sludge dewatering method |
-
1977
- 1977-03-08 FR FR7706691A patent/FR2383132A1/en active Granted
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0145700A1 (en) * | 1983-11-11 | 1985-06-19 | VOEST-ALPINE Aktiengesellschaft | Process and apparatus for the production of hydrolysates from sewage sludges, organic substances or wastes to obtain substances for use in the biotechnology |
EP0146526A1 (en) * | 1983-11-11 | 1985-06-26 | VOEST-ALPINE Aktiengesellschaft | Process for the production of organic substances or hydrolysates from sewage sludges to obtain substrates for use in the bio industry |
CN102633424A (en) * | 2011-02-10 | 2012-08-15 | 栗田工业株式会社 | Sludge dewatering method |
Also Published As
Publication number | Publication date |
---|---|
FR2383132B1 (en) | 1980-02-22 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse | ||
RC | Opposition against decision of lapse | ||
DA | Annulment of decision of lapse | ||
ST | Notification of lapse |